The flippant responses you have so far received are gentle reminders to pose these questions in the Assistant Coach Forum.
As to the question you pose, I like Dunbar's PPR production to be less dependant upon the health of the starter in front of him. Dunbar is a fine receiver, and he is electric with the ball in space. Unlike some of the others on your list, Dunbar is not well-suited for a feature role, however.
Stepfan Taylor could also have a role. I favor Taylor over Dwyer, but you will want to monitor this. Taylor does many things very well: he has good vision and patience, he has terrific hands, he is adept at picking up his blocking assignments, and he just plays smart. It is yet unknown if Ellington can carry the load, and Taylor could have a larger role than many are predicting.
CJ Anderson is an intriguing handcuff. Montee Ball is unproven, and if he struggles with his blocking or ball security, that could open the door to Anderson expanding his role beyond that as a handcuff. There was an early camp suggestion that Anderson may not even make the final roster, but I fully expect he will. Nevertheless, it is worth monitoring the preseason progress and usage of Hillman, Bibbs, Brennan, etc..
Battle has been drawing rave reviews for his work at FB in camp, but I do not expect his fantasy numbers to be much, nevertheless. That could change if Shonn Greene falters, however.